/*
 * Copyright (c) 2014-2015 Alibaba Group. All rights reserved.
 *
 * Alibaba Group retains all right, title and interest (including all
 * intellectual property rights) in and to this computer program, which is
 * protected by applicable intellectual property laws.  Unless you have
 * obtained a separate written license from Alibaba Group., you are not
 * authorized to utilize all or a part of this computer program for any
 * purpose (including reproduction, distribution, modification, and
 * compilation into object code), and you must immediately destroy or
 * return to Alibaba Group all copies of this computer program.  If you
 * are licensed by Alibaba Group, your rights to utilize this computer
 * program are limited by the terms of that license.  To obtain a license,
 * please contact Alibaba Group.
 *
 * This computer program contains trade secrets owned by Alibaba Group.
 * and, unless unauthorized by Alibaba Group in writing, you agree to
 * maintain the confidentiality of this computer program and related
 * information and to not disclose this computer program and related
 * information to any other person or entity.
 *
 * THIS COMPUTER PROGRAM IS PROVIDED AS IS WITHOUT ANY WARRANTIES, AND
 * Alibaba Group EXPRESSLY DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
 * INCLUDING THE WARRANTIES OF MERCHANTIBILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, TITLE, AND NONINFRINGEMENT.
 */

#ifndef _ALINK_JSON_H
#define _ALINK_JSON_H

#ifndef json_char
#define json_char char
#endif

#ifndef json_int_t
#ifndef _MSC_VER
#ifndef _PLATFORM_THREADX_
#include <inttypes.h>
#endif
#define json_int_t long long 
#else
#define json_int_t __int64
#endif
#endif

#ifndef _PLATFORM_THREADX_
#include <stdlib.h>
#endif

#ifdef __cplusplus
#include <string.h>
extern "C" {
#endif

typedef struct {
    unsigned long max_memory;
    int settings;
    /* Custom allocator support (leave null to use malloc/free)*/
    void *(*json_mem_alloc) (size_t, int zero, void *user_data);
    void (*json_mem_free) (void *, void *user_data);
    void *user_data;        /* will be passed to mem_alloc and mem_free */
    size_t value_extra;     /* how much extra space to allocate for values */
} json_settings;

typedef enum {
    json_none,
    json_object_e,
    json_array,
    json_integer,
    json_double,
    json_string,
    json_boolean,
    json_null
} json_type_e;

extern const struct _json_value json_value_none;

typedef struct _json_object_entry {
    json_char *name;
    unsigned int name_length;
    struct _json_value *value;
} json_object_entry;

typedef struct _json_value {
    struct _json_value *parent;

    json_type_e type;
    unsigned int begin, end;

    union {
        int boolean;
        json_int_t integer;
        double dbl;

        struct {
            unsigned int length;
            json_char *ptr; /* null terminated */

        } string;

        struct {
            unsigned int length;

            json_object_entry *values;

#if defined(__cplusplus) && __cplusplus >= 201103L
             decltype(values) begin() const {
                return values;
            } decltype(values) end() const {
                return values + length;
            }
#endif
        }
        object;

        struct {
            unsigned int length;
            struct _json_value **values;

#if defined(__cplusplus) && __cplusplus >= 201103L
             decltype(values) begin() const {
                return values;
            } decltype(values) end() const {
                return values + length;
            }
#endif
        }
        array;

    }
    u;

    union {
        struct _json_value *next_alloc;
        void *object_mem;

    } _reserved;

#ifdef JSON_TRACK_SOURCE

    /* Location of the value in the source JSON
     */
    unsigned int line, col;

#endif

    /* Some C++ operator sugar */

#ifdef __cplusplus

    public:

    inline _json_value() {
        memset(this, 0, sizeof(_json_value));
    } inline const struct _json_value &operator [] (int index) const {
        if (type != json_array || index < 0
            || ((unsigned int) index) >= u.array.length) {
            return json_value_none;
        }

        return *u.array.values[index];
    } inline const struct _json_value &operator [] (const char *index) const {
        if (type != json_object_e)
            return json_value_none;

        for (unsigned int i = 0; i < u.object.length; ++i)
            if (!strcmp(u.object.values[i].name, index))
                return *u.object.values[i].value;

        return json_value_none;
    } inline operator            const char *() const {
        switch (type)
        {
        case json_string:
            return u.string.ptr;

            default:return "";
        };
    }

    inline operator            json_int_t() const {
        switch (type)
        {
        case json_integer:
            return u.integer;

            case json_double:return (json_int_t) u.dbl;

            default:return 0;
        };
    }

    inline operator            bool() const {
        if (type != json_boolean)
            return false;

        return u.boolean != 0;
    } inline operator            double () const {
        switch (type)
        {
        case json_integer:
            return (double) u.integer;

            case json_double:return u.dbl;

            default:return 0;
        };
    }
#endif
}json_value;

json_value *json_parse(const json_char * json, size_t length);

#define json_error_max 128
json_value *json_parse_ex(json_settings * settings,
                              const json_char * json,
                              size_t length, char *error);

void json_value_free(json_value *);

/* Not usually necessary, unless you used a custom mem_alloc and now want to
 * use a custom mem_free.
 */
void json_value_free_ex(json_settings * settings, json_value *);

json_value *json_object_object_get_e(json_value * p, char *name);
char *json_object_to_json_string_e(json_value * p);
unsigned int json_object_to_json_string_length(json_value * p);
int json_object_get_int_e(json_value * p);
int json_array_get_length(json_value * p);
json_value *json_array_get_object(json_value * p, size_t pos);
char *alloc_str_from_json(const char *json_str, json_value * p);

#ifdef __cplusplus
} 
#endif

#endif

